Which lead to solder where on my 9v DC plug

Other Hardware General Electronics
1

I have a 9v battery pack and I need to solder the two leads to the plug and I don't know which part of the plug I should solder the red (+) lead to or the black lead as well.

When I look at the plug there is a short metal tab that appears to be connected to the inner metal part of the plug and a longer metal tab that is connected to the outer metal barrel.

Which lead goes where or does it matter?

SD

2

The red (positive lead) from the battery normally goes to the center of the plug (center positive) - some devices are different but most things are center positive (including the arduino).

3

Thanks for the help and clear explanation. It's time to solder.

SD